Porous carbon product and method for producing an electrode for a rechargeable lithium battery
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First Example
[0070]A sample of the soot body was ground. Since the soot body is built up layer by layer, layers that are positioned one on top of the other show a tendency to ablation at the presence of high mechanical forces, so that non-spherical, platelet- or flake-like particles with a thickness in the range of 20 μm to 50 μm are obtained. The particle size fraction with side lengths between 500 μm and 1,000 μm was separated by sieving for the purpose of further processing. The ratio of maximum structure width (mean value) and mean thickness is about 20.
[0071]A pitch powder consisting essentially of spherical particles with particle sizes between 5 μm and 20 μm was prepared by grinding mesophase pitch and by sieving.
[0072]The pitch powder and the soot body particles were homogeneously intermixed in the volume ratio of 1.6:1 and the particle mixture was heated to a temperature of 300° C. The viscous pitch surrounds the small SiO2 soot body particles and penetrates into the pores....
Example
Second Example
[0076]SiO2 soot body particles and particles of mesophase pitch were produced, as described with reference to Example 1. The pitch powder and the soot body particles were homogeneously mixed with one another in the volume ratio of 0.4:1 and the particle mixture was heated to a temperature of 300° C. The viscous pitch surrounds the small SiO2 soot body particles and penetrates into the pores. The ratio of pitch and soot body particles has been chosen such that the pitch cannot completely fill the pores.
Example
[0077]After infiltration and carbonization as explained with reference to Example 1, a porous composite mass is obtained in which the non-spherical porous SiO2 soot body particles are occupied on the outside and partly on the inside with a layer of graphitizable carbon. The SiO2 soot body particles are then removed by etching in hydrofluoric acid, resulting in a pre-product of porous carbon the structure of which derives from the original soot body particles and which is configured as a fine web with thin walls in which, however, a multitude of relatively large pore channels extend through an otherwise finely fissured surface structure.
[0078]The carbon product readily decomposes into carbon flakes. The SEM image according to FIG. 3 shows the structure thereof. A multitude of coherent pores and cavities of different sizes extend in the manner of channels through the finely fissured surface. A measurement of the specific inner surface area according to the BET method yields measuremen...
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